If Bitcoin's the man of the cryptoworld then all other currencies are his bitches. So why don't we call them bitchcoins instead of alt coins 
?
bitcoin will still the king of cryptocurrency even with the increasing numbers of altcoins. The market need those altcoins to spread the adoption of cryptocurrency and those coins aside from bitcoin are called altcoins for being the alternative coins. It's not boring as those altcoins are high risk if you don't know them. ?